Groundwater Geologist, Conservation and Survey Division

Panhandle Research and Extension Center
4502 Avenue I, Scottsbluff, NE 69361
Phone:  308-632-1382.  Fax: 308-632-1365.


  • Geochemistry of groundwater
  • Groundwater and surface water interaction
  • Groundwater management and geologic framework of Nebraska Panhandle aquifers
  • Exploration for uranium roll front deposits
  • Economic geology


  • B.S. (with honors) Geology, University of California at Davis (1972)
  • M.S. Geology, University of New Mexico (1977) Thesis title: Mineralogy, Petrology and Geochemistry of Some Lavas from Kohala Volcano, Hawaii.


  • 2004 - present Geoscientist - School of Natural Resources, Panhandle Research and Extension Center, Scottsbluff, Nebraska. Currently studying local aquifers using electromagnetic surveys in two studies with the U.S.G.S. Developed a model for the origin of the uranium deposit near Crawford, NE based on palehydrogeology and the recently revised stratigraphy of the White River Group. Logged and interpreted 350+ test holes and help design and install 600+ monitoring wells for Natural Resource Districts. Provided the public and policymakers with information on the impact of groundwater pumping in different geologic settings in order to develop plans for groundwater management.
  • 1995 - 2004 Associate Geoscientist's Conservation and Survey Divison (C.S.D.) Panhandle Research and Extension Center, Scottsbluff, Nebraska. Initiated borehole geophysical logging program to study the geology of the Panhandle aquifers. Conducted research on groundwater chemistry in the Pumpkin Creek Valley. Provided public and policymakers hydrogeologic information and background on interaction between surface water and groundwater.
  • 1989 - 1995 Assistant Research Hydrogeologist - C.S.D., U.N.L., Scottsbluff, Nebraska. Conducted research in groundwater chemistry in the Alkali Lakes Region and North Platte Valley. Developed a three dimensional modflow model to investigate the hydraulic properties of a fractured aquifer in the Brule Formation near Sidney. Provided hydrogeologic information to the public and policymakers.
  • 1987 - 1989 Senior Reservoir Technology Geologist - Exxon, Midland, Texas. Conducted detailed research of clastic and carbonate reservoirs for the development of enhanced oil recovery projects in the Permian Basin and Rocky Mountains. Interpreted porosity/permability trends, depositional environment and diagenetic history using petrographic data, well logs, core analysis and x-ray diffraction data.
  • 1985 - 1987 Senior Petroleum Geologist - Exxon, Midland, Texas. Generated prospects and development drilling in the Rocky Mountain area. Responsibilities included economic analysis, reservoir prediction and well evaluation.
  • 1981 - 1985 Senior Geologist - Exxon, Oklahoma, City, Oklahoma. Proposed, planned and supervised $45 million in development drilling in the Anadarko Basin. Responsible for subsurface mapping, well evaluation and supervising borehole geophysical logging and mud logging at the well site.
  • 1976 - 1981 Geologist, Pathfinder Mines, Albuquerque, New Mexico. Managed and supervised numerous uranium exploration and development drilling programs throughout Arizona, New Mexico, Utah and Texas for Pathfinder Mines. Interpreted borehole geophysical logs and geochemical data.
  • 1973 - 1976 Research Assistant, University of New Mexico. Investigated the detailed mineralogy of lunar samples, meteorites and volcanic rocks using an election microprobe at the Institute of Meteoritics.


Peer Reviewed Articles

  • Steele, G.V., S.S. Sibray, and K.A. Quandt. Evaluation of the Source Water near Sidney, Western Nebraska, 2004 - 2005. USGS Scientific Investigations Report - 2007 - 5086, 54p.
  • Steele, G.V., J.C. Cannia, S.S. Sibray and V.L. McGuire. Age of ground water and sources of nitrogen in the surficial aquifers in Pumpkin Creek Valley, Western, Nebraska, 2000; USGS Scientific Investigations Report's 2005, 5157, 68p.
  • Harvey, F. and S. Sibray. Delineating Ground Water Recharge from Leaking Irrigation Canals Using Water Chemistry and Isotopes. Ground Water May - June 2001, 39 (3), 408-421.
  • Gosselin, D.C., P.E. Nabelek, Z.E. Peterman and S. Sibray. Oxygen, Hydrogen andStrontium Isotopes in SalineAlkaline Lakes from Western Nebraska, U.S.A., Journal of Paleolimnology, 1997, 17, 51-65.
  • Verstraeten, I.M., S.S. Sibray, J.C. Cannia and D.Q. Tanner. Reconnaissance of Ground Water Quality in the North Platte Natural Resources District, Western Nebraska, June July 1991. U.S.G.S. Water-Resources Investigations Report 94-4057, 114 pages, 1995.
  • Gosselin, D.C., S. Sibray and J.F. Ayers. Geochemistry of K-Rich Alkaline Lakes, Western Sandhills, Nebraska U.S.A. Geochimica Cosmochimica Acta, 1994, 58, 1403-1418.

Published Abstracts and Related Presentations

  • Sibray, Steven S. Revised White River Group Stratigraphy and Uranium Mineralization in the Nebraska Panhandle. Rocky Mountain Section Meeting, AAPG, June, 2010
  • Sibray, Steven S. and Carlson, Marvin P. Nebraska - The New Uranium Frontier. RMAG magazine/newsletter, October 2009
  • Abraham, J, Cannia, J., Smith, B., and Sibray, S. Improved Hydrogeoloic Frameworks Using Helibourne Electromagnectic Surveys for the North Platte Valley, Western Optimization Model, GSA annual meeting, Oct. 2009
  • Sibray, Steven S. Uranium Exploration Targets in the Overlooked and Under-explored Nebraska Panhandle. Global Uranium Symposium. Keystone Colorado, May 9-13 2009
  • Sibray, Steven and Carlson, Marvin P. Hydrostratigraphic Controls on Uranium Mineralization - Example: The Nebraska Panhandle. AAPG Annual Meeting Denver, Colorado. June 7-10, 2009. Alternative and Renewable Energy section
  • Steele, G. K. Quandt, S. Sibray. Evaluation of Source Water near Sidney, Western Nebraska. Midwest Ground Water Conference, 20006. Lincoln Nebraska
  • Steele, G., J. Cannia, and S. Sibray. 2002. Ground-water quality and age in Pumpkin Creek Valley, western Nebraska [abs.]: Geological Society of America Abstracts with Programs, 34 (6), 97.
  • Sibray, S. and F. Harvey. 1997 Determining Recharge Sources and the Impact of Unlined Irrigation Canals in Western Nebraska, Using Stable Isotope and Major Ion Chemistry and Tritium and Carbon 14 Dating [abs.]: Geological Society of America Abstracts with Programs v. 29, No. 6.
  • Sibray, S.S. and Y.K. Zhang. Three-dimensional Modeling of Hydraulic Behavior of a Highly C onductive Secondary Permeability Zone in the Brule Formation. Proceedings 1994 Ground Water Modeling Conference, p445-452 .(poster session)
  • Gosselin, D.C., J.F., Ayers, D. Rundquist, S. Sibray and A.M. Matherne. The Alkali Lakes Project: A Multidisciplinary Investigation of a Dynamic Hydrologic and Geochemical System. Annual Meeting of Front Range Section, American Geophysica Union, Golden, CO 1993, p11. (oral presentation)
  • Matherne, A.M. and S. S. Sibray. Seepage from Unlined Irrigation Canals and the Development of Wetlands in Semi-Arid Regions Abstract. E.O.S. ,Vol. 74, No. 43, p243, 1993.
  • Gosselin, D.C., A.M. Matherne, J.F., Ayers and S. Sibray. Geochemical Characteristics of Alkaline Lakes in the Western Sand Hills, Nebraska. Geological Society of America 1991 Abstract with Programs. (poster presentation)

CSD Publications

  • Dreeszen, V., S. Sibray, and F. Smith. 2002. Scotts Bluff County Test-Hole Logs: Nebraska Water Survey, Test-Hole Report No. 79, 279.
  • Sibray, S.S., D.A. Eversoll, J. Cannia, D. Weinert, M. Brost, C. Miller and D. Carlson. Western Nebraska Geology Field Trip Guide. C.S.D. open file report, 5 pages, 2001.
  • Sibray, S., and F. Smith. 2000. Scotts Bluff County Test-Hole Logs: Nebraska Water Survey, Test-Hole Report No. 79, 49.
  • Cannia, J. and S. Sibray. Computer Mapping of Changes in Saturated Thickness of the Principle Aquifer of Box Butte County. C.S.D. open file report, 1991.


  • Member, National Groundwater Association
  • Member, American Association of Petroleum Geologists
  • Registered Professional Geologist, Wyoming #626
  • Certified Petroleum Geologist (American Association of Petroleum Geologists) #4565